| 零序保护原理概述 |
| 添加时间：2020/8/14 16:00:05 浏览次数： |
| 零序保护原理概述 Overview of zero sequence protection principle 零序电流保护具体应用可在三相线路上各装一个电流互感器（CT），或让三相导线一起穿过一零序CT，也可在中性线N上安装一个零序CT，利用这些C.T来检测三相的电流矢量和，即零序电流Io，IA+IB+IC=Io，当线路上所接的三相负荷完全平衡时（无接地故障，且不考虑线路、电器设备的泄漏电流），Io=0；当线路上所接的三相负荷不平衡，则Io=IN，此时的零序电流为不平衡电流IN；当某一相发生接地故障时，必然产生一个单相接地故障电流Id，此时检测到的零序电流IO=IN+Id，是三相不平衡电流与单相接地电流的矢量和。 The specific application of zero sequence current protection can install a current transformer (CT) on the three-phase line, or let the three-phase conductors pass through a zero sequence CT together, or install a zero sequence CT on the neutral line n. use these C.T. to detect the sum of three-phase current vectors, i.e., zero sequence Current IO, Ia + IB + ic = IO, when the three-phase load connected to the line is completely balanced (no grounding fault, and the line is not considered) When the three-phase load connected to the line is unbalanced, IO = in, and the zero sequence current is unbalanced current in; when a phase grounding fault occurs, a single-phase grounding fault current ID must be generated. At this time, the detected zero sequence Current IO = in + ID is the vector sum of three-phase unbalanced current and single-phase grounding current. |
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